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Các tinh thể chlorite-illite/muscovite có lớp chèn và lớp kẹp: Nghiên cứu TEM/STEM
Tóm tắt
Các phyllosilicates trong đá chuyển tiếp từ bùn đến phiến đá tại Lehigh Gap, Pennsylvania, đã được nghiên cứu bằng nhiều kỹ thuật, bao gồm Kính hiển vi điện tử truyền qua độ phân giải cao và Kính hiển vi điện tử phân tích. Các khoáng chất chính là “mica trắng”, chuyển tiếp từ illite trong bùn sang mica hai lớp có trật tự trong phiến đá, cùng với chlorite. Khoáng chất berthierine 7Å xuất hiện hiếm hơn. Các lớp dioctahedral và trioctahedral được chứng minh là xen kẽ trong các tinh thể cá thể ở tất cả các quy mô giữa hai thành phần cuối sau: (1) cả lớp xen kẽ ngẫu nhiên và có quy tắc theo tỷ lệ 1:1 ở cấp độ các lớp cá thể, như đã được chỉ ra, một phần, bằng hình ảnh viền lưới. (2) các gói lớp trioctahedral và dioctahedral có độ dày lên đến vài nghìn Ångstroms hoặc microns, có thể phát hiện được bằng các kỹ thuật quang học thông thường. Dải cấu trúc trung gian hoàn chỉnh được đại diện trong các mẫu đang trong quá trình chuyển tiếp thành phiến đá. Các phép đo phân tích toàn bộ (EMPA), nhiễu xạ tia X hoặc các phép đo khác được chứng minh là cho ra kết quả trung bình trên cả hai loại lớp khi không sử dụng các kỹ thuật TEM.
Từ khóa
#phyllosilicates #chlorite #illite #mica trắng #kính hiển vi điện tử #cấu trúc chuyển tiếpTài liệu tham khảo
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